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The most common form of DNA that occurs in living organisms is B-form or Watson and Crick's model of DNA. Under certain conditions, this form changes its configuration. There are 6 different morphological forms of DNA: A, B, C, D, E and Z. Three biologically active forms of DNA are A-DNA, B-DNA, and Z-DNA. A-DNA: this form is double-stranded, right-handed helical DNA. It is a dehydrated form that occurs in an environment richer in Na+ and less water. It shows 11 base pairs per turn of the helix and a diameter of 23 A. The height of the pitch is 28 A and axial rise is 2.56 A. The sugar-phosphate backbone is regular. The repeating units are mononucleotides. It shows the presence of 2 deep groves and 2 shallow groves. B-DNA: occurs at low salt concentration and a high degree of hydration (i.e. normal conditions). Z-DNA: Rich et al. working at MIT, USA studied the molecular structure of DNA fragments at atomic resolution. They proposed a Z-form of DNA along with B-DNA. The Z-DNA shows the following characteristics: It is stabilized by high salt concentration. It is left-handed DNA. It is a double-helical structure with a zig-zag sugar-phosphate backbone. In Z-DNA, the repeating unit is a dinucleotide and the sugar residues have an alternating orientation of dinucleotide. In Z-DNA, 12 base pairs are present per turn. The height of the pitch is 45 A. The diameter of the helix is 18 A For additional information about DNA and Nucleic acids, you can also refer to • Watson and Crick's Model of DNA: (Part-I) ... (“Watson and Crick’s model of DNA: Part-I (Characteristics)”- The video explains characteristics of DNA molecule with suitable models.) • Nucleic Acids: Composition (Part I) - Simp... ("Nucleic Acid Composition Part-I" Video describes various components of nucleic acids and gives a simple trick to draw and remember the structure of nitrogen bases, ribose and deoxyribose sugars. ) • Nucleic Acid Composition (part II): Format... (‘Nucleic Acid Composition Part-II: Formation of polynucleotide and nomenclature of N, NS and NT’) • Nucleic Acids: Made it easy ("Nucleic Acids: Made it easy" )